Much of the published work on gonococcal infection of the throat dates from the seventies and early eighties, a period during which the incidence of gonorrhoea in the Western world was significantly greater than today. Epidemiology There is general agreement that oropharyngeal infection occurs most frequently in homosexual men, followed by women and heterosexual men. The table gives comparative prevalences from four studies of patients with gonorrhoea.Weisner et al4 found the oropharyngeal isolation rate of neisseria species from his population was: N meningitidis 17.2%; N gonorrhoeae 5.6% and N lactamica 1 9%.Young and Bain5 noted that, of gram-negative diplococci cultured, 74.2% were N meningitidis, 20.3% N gonorrhoeae and 3.7% N lactamica.
DiagnosisNo standard method has been agreed for sampling the oropharynx and it is therefore difficult to compare the prevalence of oropharyngeal gonococcal infection between different studies. In their pioneering article in 1973, Bro-Jorgensen and Jensen were not only the first to recommend routine cultures from the oropharynx of patients with gonorrhoea, but described a thorough technique worth following: ". . . avoiding wetting the swab with saliva, swabs were rubbed against the surface of the tonsils, inserted into the crypts and the spaces between the palatine arches and the tonsils and finally rolled over the posterior pharynx".2 There are no published studies on the value or otherwise of multiple sampling from the oropharynx, as there are for other sites.Microscopy of samples from the oropharynx is unhelpful in the diagnosis or exclusion of gonorrhoea because of the presence of other neisseria species. Laboratory culture is therefore necessary with further differentiation between different neisseriae, simple carbohydrate utilisation tests having been largely superseded by commercial immunological tests based on monoclonal antibodies and, if necessary, biochemical tests. Recent work by Comparative prevalences of oropharyngeal gonorrhoea Source (n) Women, % +ve Het men, % +ve Hls men, % +ve Weisner' (2224) 10-3% 3-2% 20-9%